After lifting its viewable impression advisory on March 31, 2014, MRC spelled out certain steps to be followed by MRC-accredited viewable impression measurers in order to reduce discrepancies in viewable impression counting.

Since then, measurement vendors have been moving to adopt MRC’s reconciliation guidance. The latest information on the statuses of each accredited vendor is available here. The chart will be updated on a weekly basis through June, and as necessary thereafter.